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Surround Sound

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Prsntn on surround sound for college seminar....

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Surround Sound

  1. 1. Surround Sound Presented by:-
  2. 2. What Is Surround Sound? <ul><li>Refers to the use of multiple audio tracks to envelop the movie watching or music listening audience. </li></ul><ul><li>And making them feel like they're in the middle of the action or a concert. </li></ul>
  3. 4. <ul><li>The surround sound allows the audience to hear sounds coming from all around them. </li></ul><ul><li>&quot;Suspended disbelief&quot; is when the audience is completely captivated by the movie experience and is no longer aware of their real-world surroundings. </li></ul>
  4. 5. <ul><li>There is one center speaker which carries most of the dialogue and part of the soundtrack.  </li></ul><ul><li>There are left and right front speakers that carry most of the soundtrack and may carry parts of the dialogue </li></ul>
  5. 6. <ul><li>There is a pair of surround sound speakers that is placed to the side (and slightly above) of the audience to provide the surround sound and ambient effects.  </li></ul><ul><li>Finally, a subwoofer can be used to reproduce the low and very low frequency effects (LFE) that come with certain movies </li></ul>
  6. 8. Surround sound technology is used in <ul><li>Cinema and home theater systems </li></ul><ul><li>Video game consoles </li></ul><ul><li>Personal computers </li></ul>
  7. 9. Monoaural <ul><li>The simplest method, and the one used in the earliest sound movies, is called monaural or simply mono . </li></ul><ul><li>Mono means that all the sound is recorded onto one audio track or channel </li></ul>
  8. 10. Stereophonic <ul><li>Two-channel recordings, in which sound is played on speakers on either side of the listener, are often referred to as stereo . </li></ul>
  9. 11. Early Surround <ul><li>The first use of surround sound was in 1940, for the Disney studio's animated film Fantasia . </li></ul><ul><li>The sound was diffused throughout the cinema, initially by an engineer using some 54 loudspeakers. </li></ul>
  10. 12. Creating surround sound <ul><li>The first and simplest method is using a surround sound recording microphone technique </li></ul><ul><li>A second approach is processing the audio with psychoacoustic sound localization methods </li></ul><ul><li>A third approach, based on Huygens' principle, </li></ul>
  11. 13. Monophonic Sound <ul><li>Monophonic sound is a single-channel, unidirectional type of sound reproduction. </li></ul><ul><li>To the ear, all the elements of the sound, voice, instruments, effects, etc... appear to originate from the same point in space. </li></ul>
  12. 14. Stereophonic Sound <ul><li>Stereophonic Sound is a more open type of sound reproduction </li></ul><ul><li>Although not totally realistic, stereophonic sound lets the listener experience the correct sound staging of the performance. </li></ul>
  13. 15. The Stereophonic Process <ul><li>The main aspect of Stereophonic sound is the division of sounds across two channels. </li></ul><ul><li>The recorded sounds are mixed in such a way that some elements are channeled to the left part of the soundstage; others to the right. </li></ul>
  14. 16. Limitations Of Stereo Sound <ul><li>Some recordings resulted in a &quot;ping-pong&quot; effect. </li></ul><ul><li>Also, even though the sound was more realistic, the lack of ambience information, such as acoustics or other elements, left Stereophonic sound with a &quot;wall effect&quot; </li></ul>
  15. 17. Surround sound specifications <ul><li>3.0 Channel Surround </li></ul><ul><li>Extracts 3 audio channels :- </li></ul><ul><li>Two channels for speakers at the front—left (L) and right (R). </li></ul><ul><li>One channel for surround speaker or speakers at the rear—surround (S). </li></ul>
  16. 18. <ul><li>4.0 Channel Surround (analog matrixed/discrete: Quadraphonic) </li></ul><ul><li>Extracts four audio channels :- </li></ul><ul><li>Two channels for speakers at the front—left (L) and right (R). </li></ul><ul><li>Two channels for surround speakers at the rear—surround left (LS) and surround right (RS). </li></ul>
  17. 19. <ul><li>4.0 Channel Surround (analog matrixed: Dolby Pro Logic) </li></ul><ul><li>Extracts four audio channels :- </li></ul><ul><li>Two channels for speakers at the front—left (L) and right (R). </li></ul><ul><li>One channel for speaker at the center—center (C). </li></ul><ul><li>One channel for both surround speakers at the rear—mono surround channel (S). </li></ul>
  18. 20. <ul><li>5.1 Channel Surround (3-2 Stereo) (analog matrixed: Dolby Pro Logic II) </li></ul><ul><li>Extracts Five audio channels :- </li></ul><ul><li>Two channels for speakers at the front—left (L) and right (R). </li></ul><ul><li>One channel for speaker at the center—center (C). </li></ul><ul><li>Two channels for surround speakers at the rear—surround left (LS) and surround right (RS). </li></ul><ul><li>One low-frequency effects channel (LFE). </li></ul>
  19. 21. <ul><li>6.1 Channel Surround (analog matrixed: Dolby Pro Logic IIx) </li></ul><ul><li>Extracts six audio channels and one low-frequency channel :- </li></ul><ul><li>Two channels for speakers at the front—left (L) and right (R). </li></ul><ul><li>One channel for speaker at the center—center (C). </li></ul><ul><li>Two channels for surround speakers at the sides—side left (LS) and side right (RS). </li></ul><ul><li>One channel for surround speakers at the rear—back surround channel (BS). </li></ul>
  20. 22. <ul><li>7.1 Channel Surround (digital discrete: Dolby Digital Plus, DTS-HD, Dolby TrueHD) </li></ul><ul><li>Delivers seven audio channels and one LFE channel :- </li></ul><ul><li>Two channels for speakers at the front—left (L) and right (R). </li></ul><ul><li>One channel for speaker at the center—center (C). </li></ul><ul><li>Two channels for surround speakers at the sides—left surround (LS) and right surround (RS) </li></ul><ul><li>Two channels for surround speakers at the rear—left back (LB) and right back (RB). </li></ul>
  21. 23. Surround Sound Formats <ul><li>Dolby Pro Logic </li></ul><ul><li>Dolby Digital </li></ul><ul><li>DTS </li></ul><ul><li>THX Surround EX </li></ul>
  22. 24. Dolby Pro Logic <ul><li>It is the simplest, cheapest format. </li></ul><ul><li>It has 4 channels that are compressed into two analog channels, so you can record it on your stereo VCR and it can also broadcasted even over analog radio or cable TV. </li></ul>
  23. 25. Dolby Digital <ul><li>It is a 6-channel format, referred to as 5.1-channel </li></ul><ul><li>Advantages over Dolby Pro Logic include the fact that all channels are digital, discrete and 5 of them are full-bandwidth. </li></ul><ul><li>Additionally, the surround speakers use separate left and right channels (stereo). </li></ul>
  24. 26. DTS <ul><li>DTS is also a 6-channel format (5.1-channel). </li></ul><ul><li>The main difference from Dolby Digital is that DTS uses less compression thus providing marginally better sound </li></ul><ul><li>DTS is less widespread than Dolby Digital. </li></ul>
  25. 27. THX Surround EX <ul><li>THX Surround EX takes the Dolby Digital signal and creates another additional matrixed channel, which is then sent to one or two surround speakers, thus giving a 6.1 or 7.1 sound. </li></ul>
  26. 28. Dolby Surround Basics <ul><li>The Dolby Surround process involves encoding four channels of information--Front Left, Center, Front Right, and Rear Surround into a two channel signal </li></ul><ul><li>A decoding chip then decodes the four channels and sends them to the appropriate destination, the Left, Right, Rear, and Phantom Center </li></ul>
  27. 29. The Limitation Of Dolby Surround <ul><li>With the rear channel being basically passive, it lacks precise directionality. </li></ul><ul><li>Also, overall separation between channels is much less than a typical Stereophonic recording. </li></ul>
  28. 30. SDDS <ul><li>The latest entry in cinema digital sound, Sony Dynamic Digital Sound® (SDDS) </li></ul><ul><li>It boasts five separate channels at the front of the theater as well as left and right surround channels, for a total of eight available channels including the subwoofer. </li></ul>
  29. 32. Conclusion - For Now... <ul><li>Today's surround sound experience is the result of decades of evolution. The surround sound experience is now easily accessible, practical, and affordable for the consumer. Go get surrounded!!!!!!!!!!!! </li></ul>
  30. 33. <ul><li>THANK YOU </li></ul>

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